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Tools:
Wrench, Allen, 5/32 inch, long handled
Loose pan/tilt drive belts can create calibration problems. When the
luminaire reaches the end of travel, excess belt slack can produce a
vibration causing the encoder to continue producing a movement output
signal to the processor (even though the luminaire is at its stop).
To fix this problem, slowly increase the belt tension until the vibration is
dampened.
CAUTION: Do not overtighten belt, pulley will break.
To adjust either the pan mechanism or tilt mechanism pulley belt:
Step 1. Pan or tilt luminaire head back and forth, noting the tension
created on one side of belt and deflections on the other
(
Figure 3-40: Belt Tension Adjustment
Deflections are present
when belt is loose.
Pan/Tilt Mechanism
Drive Pulley
Driven Pulley
Tension side
of belt
When pushed, belt should just touch rail
when tension is adjusted correctly.
Feed side
of belt
Belt Tension Adj. Screw
